Owing to the fact that testing is becoming a part of programming, developers are able to correct errors at the very early stages of development. This allows to decrease the risk of defects occurring in the end product. The earlier the process of testing is started, the earlier possible errors are found and the less it costs to correct them.
Without proper quality control, software products can cause significant harm to both the company that orders the development and owns the software, and to the end users. Financial loss and loss of brand confidence are just some of possible consequences.